What is true about ribosomes?

1. The prokaryotic ribosomes are 80 S, where S stands for sedimentation coefficient

2. These are composed of ribonucleic acid and proteins

3. These are found only in eukaryotic cells

4. These are self-splicing introns of some RNAs

 

Subtopic:  Ribosome and Inclusion Bodies |
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Select the correct statement from the following regarding cell membrane.

1. Na+ and K ions move across cell membrane by passive transport

2. Proteins make up 60 to 70% of the cell membrane

3. Lipids are arranged in a bilayer with polar heads towards the inner part

4. Fluid mosaic model of cell membrane was proposed by Singer and Nicolson

Subtopic:  Cell Membrane |
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Important site for formation of glycoproteins and glycolipids is

1. Golgi apparatus

2. plastid

3. Lysosome

4. vacuole

Subtopic:  Golgi Apparatus |
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Which one of the following also act as a ribozyme in a bacterial cell?

1. snRNA

2. hn RNA

3. 23 S rRNA

4. 5 S rRNA

Subtopic:  Ribosome and Inclusion Bodies |
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In eubacteria, a cellular component that resembles eukaryotic cells is

1. nucleus

2. ribosomes

3. cell wall

4. plasma membrane

Subtopic:  Cell Membrane |
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Peptide synthesis inside a cell takes place in

1. mitochondria

2. chromoplast

3. ribosomes

4. chloroplast

Subtopic:  Ribosome and Inclusion Bodies |
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Which one of the following structures between two adjacent cells is an effective transport

pathway?

1. Plasmodesmata

2. Plastoquinones

3. Endoplasmic rcticulum

4. Plasmalemma

Subtopic:  Cell Wall |
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Which one of the following has its own DNA?

1. Mitochondria

2. Dictyosome

3. Lysosome

4. Peroxisome

Subtopic:  Mitochondria |
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The main arena of various types of activities of a cell is

1. plasma membrane

2. mitochondrion

3. cytoplasm

4. nucleus

Subtopic:  Cell Organisation |
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The plasma membrane consists mainly of

1. phospholipids embedded in a protein bilayer

2. proteins embedded in a phospholipid bilayer

3. proteins embedded in a polymer of glucose molecules

4. proteins embedded in a carbohydrate bilayer

Subtopic:  Cell Membrane |
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